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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c453d60a99004de9fff9ef710d24a3d894e3c5fd5744e63f77100ea608b932' 
  AND token = 'r9ydCqfBrTvl+Rs5ni7ohM9w3a17RzyziL9Ns7Myadc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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