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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579e47f903ceb0623694fbd06cb6e2a142eea92c657bfe42a8faad71b8f574e7' 
  AND token = 'NDIpE35+emSp1ijTzM0DTbM13MW0y3ZvzaU8tOSy0kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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