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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ef3ddcff794edf036082184d5e55c81f1478749e6db24913e5527ffcb6aae9' 
  AND token = 'lavTysS8404pNnXQrQbMk8RJv/VjTM17B7H6dFl6vdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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