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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '728b90e6fa44b74054e0bd504a4316e2d92f9d6c2b9d6a9d15fa36ab2a086469' 
  AND token = '4JOJgCHMzo99UhHToFhhx30k8PsqYFYUC05pWA6x8qE=' 
  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"
    }
  }
}