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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59b21c4c0ad741aa603660de52c8b77be5ed0afdbc5803431b924b8127600d6' 
  AND token = 'v+Z9kGQcNuix9saJ3tj2r9rScnuE8EGbSwUJCeoAlnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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