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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5333b9fc23bc2ccb580f5208136fc90f209d8378c6b8110df487934190ac9f' 
  AND token = 'uOuaW8ABHipDXaO9csLQHhXxXctbJoi/iQ+y3ZAB664=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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