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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6cc32aa8c66b91c82dc02b98d08d78fd028ba66e7b9289ec8d99c2df0c93adf' 
  AND token = 'Zd9Nt564ubnHbCi13ECW1r7OkRF7Tn0nQCDshXjYvLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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