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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f735952be181a9c3b863da0e767bb5e5636f5120300db634b36c988a28967e' 
  AND token = 'NUKNBJPdweC0WYSYyYWUdmjSB93GaD8B43d1gro4rW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}