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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801f71c347105b4d579b30e5aef9a641a2e2bd3fc0a251f52ff7ce08b9a63a16' 
  AND token = '2LjxokuwVGvS1vRrvv1EUiWC4yRozvPgjE+kkLtWd+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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