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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474716280b226ed7fc5e92bc68c18321aa4bf28d6a8be2162d641d27e0a7b0f5' 
  AND token = 'WWD2mIEk7pPs4nPz4wZnQx1pXldc5Brla7Qn5lASI0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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