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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2faa73ac71baf88444f96b850611e477a74bd54a23fea23cefa5302575ec2639' 
  AND token = '4h7Gq5ahcHZo/sWFO7pniuftNbnjMLeuDMrmM4KD2zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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