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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbbb1d7135b7d57f3f339fa095ba64ae78232704db5f2e8eb77895e240fdc35' 
  AND token = '6bauGNYbQAq0oDicV5PtnivFosp9Fbxt6dMQmZTW+NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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