Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ce1e390f50b0f52712fbb83524e43b73cef0fc3aea5098cb67dccc70fc0a6d' 
  AND token = 'gUAIjQ2pIB98dQIpGVYSHWUcL/WohfGORLBF5MFUEM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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