Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12eafa6bcff1255c9ca266082ab1bd164cc8673540f6a6be63f05c4548e1ede8' 
  AND token = 'Um3+RbzvjC+fGonHGzxkwJAPR5bCECfOtreyOkDe4OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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