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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6811e9db3defafc6fbae90eb600aa20963da6bbf5a09822d8ab12ec230176344' 
  AND token = 'RLelvqs88RHt2qa1ICywzeFGkko5nv1aW+uC7iIV7fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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