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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd54a0edd52c7ebf98d895adb62267b1494f97dbbc407287d33f411b7dcc009f' 
  AND token = 'rO3GoC0mkut8I3vca0bCvy62YFLTMnkCHTOmi/NzVvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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