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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c9dbb32d0be354d6b6b6da05bc56e7dd075fed5870380c43d705ad61b9f360' 
  AND token = 'Np1Ftx+yC+ABe+jeYZzAmyx3jkKWkauE0qorpjk3zko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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