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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d73784ffc6e998e917737d071d3dc84c068be91da15d5caf625b57159320874' 
  AND token = 'ZR7DFZYOpbzdOF7c2LR7gWl2ZlyCYRm6o2XlSdFjzh4=' 
  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"
    }
  }
}