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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5ebf142b2768eca34c0426a40bfefb226afa953c54053a4598a61da3bd8e2b' 
  AND token = 'STAZ8taOOUqXQ2bLzeWsgQnNZwEbwFprthW8TjTp/a4=' 
  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"
    }
  }
}