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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'def3288049fd6af80b6480f1c05e27d797c691a77c67d3213f6d08392504d919' 
  AND token = '1t5vIT3xgyclZxNfTiA3Tx+zRQkPW9Bs+uCMui0uxfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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