SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b463e56c759d2b83822f5675bef024c0a038ef92883715865ab2543fdaf4b108' 
  AND token = '90Fw/1+9AQewGKLvZGv5qdxT8yhlYrWztkcoIf5M8iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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