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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd625e68c83b01cbb92e66e6ebb437af949566c9d9a8e8685c685c6fd280af960' 
  AND token = 'PsRnSZ6DLz8Joldna+6rsdG39K4PX4Lh1qbiwGt256U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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