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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6741b25de5fc7a26d1d708c930b893d1dc918c2b9ec466869f8154868ca23060' 
  AND token = 'Jxn0KFNU4KSbG4z40gI/5oeAPfNFCWM0R6A/rmrO3nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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