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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '557b8425a25f5690490f89dcb32c9e2db52691d8e793ceb19cde1df464d9bc52' 
  AND token = '6ubgALTGeSTmV30w76Il4g9fT5kxn57Mr2ufVa9e4nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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