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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af78e711bb2c533a2fc0ad99d1aaa58c35cd8c803884c8382f69d731fc1e659' 
  AND token = 'wV+XSn+2pCh5oakHDS8zKeeLpR0sZRvAucP6bMlFO9E=' 
  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"
    }
  }
}