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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc2671af0ab24b02b19a6c8b8a2e35e6075d9ae31c214877773abfd78e4ad70' 
  AND token = '9N8OZnDFnznIU6YUoIjLu/cNraFSKb3DFRYyDUCmRlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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