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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6d94a3f48ba739953035f2666c49c58246c0364211c961a0c32e059cbf65e9' 
  AND token = 'JSD5gDebm7KIU6UXnMVfzjuchPK7qf+eD5+tgWrKnDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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