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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3610b268425e225d8428b8b4ae283d985d047cd1ce88b7077c35b8efa5eb1443' 
  AND token = '7a+xKha2SgW/MEbvUtQAC0pLvNaCn23SOKyC5T/DzI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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