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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6adda19277dd7433c3510b8f3ab41c285cf347b10daf6892a092eb9c41fc3e00' 
  AND token = 'MdiRvKbddjQF47BiOgwkZxwEthYRQXb7BwtJab1BWQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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