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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f568979330132175959a3e31ede9d7a34978a51515a24345e7833d5485e512a' 
  AND token = '+lVmHWqS5U/kYgxFfuC9sKBCrmGJZR0P3LEf4NLNkpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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