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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04acea05b991e1cbc57619cff70fe08b68f5bb2978b5ba85cd6d4c6ac13f3805' 
  AND token = 'KxdWBZ3sXj5xblwcpVYPdlYV9ro4dH62AIc0Bu8ihpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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