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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50a76fee453943104ba5db0950dad411c36fed3a3dcc2377846ed98adfe4710d' 
  AND token = '2TVxNApRF1UXxl7JiEoDkOegI7QxdMWTAr76s8W1llM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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