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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d4c4377fa44cfba04a2bdbcfc03a1efd070c74dd17b538ece72956449977c7' 
  AND token = 'uVprfZIms0g2dVw9vp+UWKgD7/O94NVxhCFmT0727LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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