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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be41facdce1f409476b8c1a90c6540ddd1ef2c11d491df9b135fcbe77666661' 
  AND token = '5o1FmX2sE928kG6hwYk6UoH8vbd5+PzI0uwvBrL5MOw=' 
  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"
    }
  }
}