SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11af094061911b1d4aabb3cbe3af32fc05292cf2e9c384b8d482277e98c6c605' 
  AND token = 'FWVmuLkH4ecr4qFsd0wZR5Bjvx3+RWJ4qTbPrQPVU7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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