SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e801f658f0b647d51f02015cc91272699daeab731c710371d17e4f1432396ffc' 
  AND token = 'jlveJSJ/ksGqp9pJVH8gk9U14FP1D3ZztzNqwKkKffQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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