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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79dd037121e03243e652261032d432ab86f894e181c789da6ddb18c6568640c2' 
  AND token = 'N49d9sby/7fY0NYWljuBFBPf1yev3JKVuAmY7OqTnCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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