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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df1ec33fee41750ab9acbf2708fd13486a23f05158b99f6dd278a32dd40493c' 
  AND token = 'S8i5tjO0SKnZQ3XkfZUI6FrjdsqLLx8z8f2zDepTeUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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