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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440980c9b2b6ec105c25ff6bd752f3818b558a157334cc0252d53b56e0003d15' 
  AND token = 'E9hbQChq2QnesKC3/k/PFwDg9aHyiRid6I/nWFqC4CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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