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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0a18a043a090cdcfbd0c038a920e5c3d68c96d09b85c5fe821bdda1655e272' 
  AND token = '9JGPedR1V/xcsC0mlaEj4l/PSjFuRKSxvK2rV/uDcuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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