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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da6e008563f682b9a63ef858b4bafecc37797932d6239e2692a9df063ae1e0c' 
  AND token = 'PHy3Q1cOjETOASUOlrEi+JUUfTscYun+ZDC2sjA/bpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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