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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0454cec380961544724bfffb7c75e94a1e4a5b044e4cf8cc47443825d3cbcf' 
  AND token = 'Qx8fi+3FLNMlkbBNTCEspubTZjtDrv30DL2ksiINi4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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