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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db169eb95dd5a9093d204b768b9f82da91383ee30aac63b24b917400a441449' 
  AND token = 'YKLSCRiCxZafQRPZs3ZizT8j8+ZmJOR8OtkBZ8Jg8M4=' 
  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"
    }
  }
}