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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66deb08de4991f181fc31310c3d9737368ca1a945a1bc642c763d46af867e40c' 
  AND token = 'Xrv43JohLWX26MeYvJTw+m7TF00Kx2lkNj0F+YRtyTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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