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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e267bc240830a412a7d60afc6aee788f97a4c85a22bf67dbd04a0a882db1839e' 
  AND token = 'Icby8ZQtK0acJ2vC6jplCNJUw1doVDXZC20eDM/DUXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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