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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b65a782db1cb5daab5a1ea9953c0d0acf294446fcc3aa74bb7fffd333d9bd0' 
  AND token = 'aWt0xQ9R6FJL8qtc4dfxggML7l6r3lKdQGv8wuhjHgU=' 
  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"
    }
  }
}