SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbed0a577191be76312509d1c025f15f1b8fdf7d8073614d8c8d987ddd043c39' 
  AND token = 'Ybp6+9zvG0Sk7vpBz/FqAgugpMSTjc3/QAHzHpruWfM=' 
  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"
    }
  }
}