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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8b3ced830aed7316e9826d89db205bd463e2ab024a0057abde076de7905d84' 
  AND token = 'S902zI+Py7SEvzHsGOTGGe/yLXLpmadR324uCIieL3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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