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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0272f285992b7633c49a674c48634bd71118e7858adfe2a152710342f9f479e' 
  AND token = 'blZQzgbzT2v49hNauH0QUaF0KnTI6VLmgc4a6GInYnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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