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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c637929bbeedc2ce9e87a6e1b7e1bf8a89dbcfdc4a5d4232e8d33b061df5c772' 
  AND token = 'UeJRhI7zpn9wzv8G8dRJm0hqOoFMJ/IZy3GC0u14880=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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