SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb1adcf26c462811193953cb3f7dc2d859f0f16ea3415b8a5ec8061078f73d8' 
  AND token = '3KYSbhZ8UKWbU2g5mPWagCGWV8+n9Te9d/j0FlPKq2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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