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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b33255c7fe926f74f10b961d7a54870670733c136316a874bd820f816b4c51a' 
  AND token = '7Yus3CUZK2DbbverLutQs8ctwRW2+uhnkzA14TDjfg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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