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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '049eabd716b452a65a14ea658ec9921926412029196c2ab6a982152350ad0de4' 
  AND token = 'REdzv8i/xNBer1c0Wq0W5/yB5pgO9wuaAvF+cVU6S5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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