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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c18a7e82379b67b0707771606e83c2dc319fc1e6d872a6f74aea62ae84ce951' 
  AND token = 'HRalomOgYpE7VtjPczkAhPgKcDLmPqV9z9ttxZkpq1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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