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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410a569d6038287de4256fa0171bde98f66f69ff444aab659d79aa60cc0311c7' 
  AND token = 'NY1D04UnMonk/0EIPE5d3pimnZOGCFhBko1Kh7iqop0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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