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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0843b7830b6b45ca4893335d109c17b5a6c1805c33f506093ec608d55fa6d357' 
  AND token = 'j4pZb1cQYjB+hmGj8SipFKEX4xb49RJHcxmwOk7PfJM=' 
  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"
    }
  }
}