SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda9f537db98bab14971a2c4da50d617f0ae4e2cb96315ff54aed8358e4e368e' 
  AND token = 'ivg8VvpRl0BgJtgA7aMsz/qtPyNmK747vO87Dl/ij/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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