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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32aa792515a9c2d9febc96cc8e89fb3e2054049b3490f18a3a058c890050648' 
  AND token = 'XLPpioW1E2u3LgY6KV855qDYQqxSEibZM7WX6GJHx2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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