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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409ad4530d0a17e425463a61ee67a9ab1ea5d91657e90e7d74288140007a54bb' 
  AND token = 'p7GYWvNhNXNznXILSA4+LwIX/GTsZ0JyzFuUZrLe2sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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