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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc29d0e297e09d77611f770e79be98e8702a73f661d092bb8b7b71c19efdc48' 
  AND token = '35tErT+9PVg8dpZqLx0wlvR8jTEpr8+ye8I+wRnG0uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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