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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa5108efe18816d5fcab3c3683b0a5fc7be4f9ad94618d395fcf163593ca9ec' 
  AND token = 'IJIKtigLYjKluDuatsQs9IPZ0KZ/rzhYh5PSctqdpmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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