Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73476808b76e6d7aee54bdd7ddd46699c210bb0b0c047cd4d3400484e11d9842' 
  AND token = '8c1K9i85WrUg5QV0vTrGvt7D4mY4dsHBUlNOAD6k85g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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