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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb357954d2f043b23a965dbc7372e6a9c96f8d89692fca631591ca16a2d659e' 
  AND token = '5uq75iFDdw1JqIfSq9H93/ilzTtVmCvRyRWX2tJ7Wzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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