Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f02718ca439b84948cc924ffd764cfcaaef888fa30f145f7421fbb9082fc4a' 
  AND token = 'iELZgXxUHYVNO7qU+sSx0fFO+8x4NeB7XFpS2gljBUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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