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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5beec11d2e4af7aadd955d9d008e4ef5163d3475353eca3781655a4a651b6870' 
  AND token = 'UDqvgZB3gBWsVVkafHVt7Nmw16F+wsv7OF39MnG8LgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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